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Simplifying 81(90 + x) = 90x (90 * 81 + x * 81) = 90x (7290 + 81x) = 90x Solving 7290 + 81x = 90x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-90x' to each side of the equation. 7290 + 81x + -90x = 90x + -90x Combine like terms: 81x + -90x = -9x 7290 + -9x = 90x + -90x Combine like terms: 90x + -90x = 0 7290 + -9x = 0 Add '-7290' to each side of the equation. 7290 + -7290 + -9x = 0 + -7290 Combine like terms: 7290 + -7290 = 0 0 + -9x = 0 + -7290 -9x = 0 + -7290 Combine like terms: 0 + -7290 = -7290 -9x = -7290 Divide each side by '-9'. x = 810 Simplifying x = 810
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